/*
 * @Author: your name
 * @Date: 2021-09-30 22:28:06
 * @LastEditTime: 2021-09-30 22:28:06
 * @LastEditors: Please set LastEditors
 * @Description: In User Settings Edit
 * @FilePath: \luogu\test\main.cpp
 */
#include<iostream>

using namespace std;



int main(){

}